Wiktionary
for toffee
adv. (context chiefly British intensifier English) at all.
Usage examples of "for toffee".
Tall, slender, with wonderful Titian hair and classically beautiful in the sculptured Greek fashion, Miss Haynes, it was universally conceded, couldn't act for toffee.
There was just one little thing standing in the way of his brilliant career: He couldn't write for toffee.
Monica, playing the ambassador's beautiful ex-actress wife, couldn't act for toffee.